Machine for stripping file-blanks



(No Model.) I

l A.' WEBB.

MACHINE FOR STRIPPING PILE BLANK'S. No. 287,072. Patented Oct. 23., 1883,.

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YUnirse STATES PATE-Nr Orricn.

ALFRED vW'FED, OF PHILADELPHIA, PENNSYLVANIA.

MACHINE FOR STRIPPING FILE-BLANKS.

SPECIFICATION' forming' part of Letters Patent No. 287,072, dated October 4523, 1883.

Application filed February 1S, 1882.

T0 @ZZ whom it may concern.-

Be it known that I, ALFRED XVEED, ofthe city and county of Philadelphia, inI the State of Pennsylvania, have invented certain new and useful Improvements in Machines for Finishing File-Blanks. The following is a specification of saidimprovements, reference being had to the accompanying drawings, wherein- Figures l and 2 represent, respectively, side and end elevations of a machine embodying my invention; Fig. 3, atop or plan View thereof; and Fig. 4, a view in perspective, and on an enlarged scale, of certain details thereof.

For the production of an accurate and uniform cutting-surface upon a file it is of the utmost importance that the surfaces of the. blank whereon the teeth are to be cut should be true, and that a smooth and even finish should be given thereto. Such machines as have heretofore been used for the finishing or stripping of file-blanks have been open to the objection that inequalities in the edge of the strippingtool or variations in the hardness of different portions thereof produced grooves or ridges in the surface of the blank. Furthermore, owing` to the direction of the lines of cut of the stripping-tool, it has been found that a hard or glazed77 surface is produced upon the blank, which renders the cutting of the teeth thereon difficult.

It is the object of my present invention to remedy these defects; and to that end my improvement-s consist in giving to the blank, while under the action of the reciprocating stripper, a radial motion in the same plane with, but across, the lines of. reciprocation.

Thus not only does each portion of the strip` vper traverse the entire surface of the blank,

but the lines of cut are compelled to intersect each other in a peculiar manner, being resultants of the two movements. I have found in practice that the blanks stripped in this manner not only have a true and uniform huish, but that the surface is not glazed, and is much more easily worked into teeth than where the stripping has been performed mechanically by the methods hitherto employed, or even by hand. I also suspend .the work-plate and the tool upon bearings which vpermit them to rock freely in directions at right a-ngles to one another, and thus to automatically level them- (No model.)

selves, and obviate any tendency toward irregular cutting- In the accompanying drawings, A A are the housings, upon the top of which are mounted the horizontallyoscillating frames B, each pivoted at R. Vertical standards B, upon each of the frames B', are threaded to receive supporting-screws H, the pointed ends of which are inserted into seats in the ends of the workplate G. The work-plate G is a flat plate of metal having a clamping-screw, J, which secures the tang of the lile-blank F and holds it firmly in position. The work-plate with the' blank is thus free to rock laterally upon the points of suspension. The overhangin g free ends of the frames B rest upon a horizontal plate, X, and are received between lugs z e thereon. The plate X is supported by the revolving horizontal disk XV, upon the face of 7o which is a wrist-pin, Y, engaging in a lateral slot, U, of the plate X. Thelongitudinal slots U (see Fig. 3) in the plateX receive the guidepinsY,which project from the housings. (See Fig. 2.) The plate X is thus free to be moved longitudinally by the revolution of the disk NV and pin '111, and by its motion to oscillate the frames B upon their pivots R: The shaft of disk "W is mounted upon a bracket projecting from thehousings, and is provided at its lower end with a worm-wheel, V, engaging with a worm or screw, T. The worm-shaft is rotated from the driving-shaft of the main pulley M by means of the pulleys I? P and belt Q. A vertical lever, T, pivoted to the base of 8 5 the ends of the tool-holders D prevent their longitudinal displacement; but they are free to rock laterally, the offsets being provided with slots s', through which the headed pins s project, so as to maintain the holders in their lseats,while permitting their partial rotation.

IOO

The operation of my machine is as follows: The uniinished file-blank F being secured upon the work-plate Gr by inserting the tangbeneath the screw-clamp J, the driving-shaft is rotated and the lever T reciprocates rapidly back and forth, causing the stripper E to opcrate upon the face of the blank. At the same time the rotation of the screw T actuates very slowly the revolving disk NV, whose crank-pin Y effects the reciprocation of the plate X, and thus slowly oscillates the frames B radially upon the pivots R and across the line of motion of the stripper E. The lines of cut are therefore resultants of these combined movements, and each portion of the cutting-edge acts upon the entire surface of the blank, thus producing a most perfect and uniform finish. Furthermore, the stripper and the blank, being free to rock upon horizontal axes at right angles to one another, adjust themselves automatically to the proper plane, and thus insure the parallelism of the sides.

I am aware that it is not new to move the file-blank in a direction whose line is approximately that of a figure 8, the stripper being stationary during such movement. In this mode of operation, however, the stripper retraces its exact path at each complete reciprocation, and the production of grooves and ridges is not avoided, the only result being` that they take the form of a iigure 8 instead of being straight and parallel, as in the other old forms of stripping devices. The main object of my invention being to so move the stripper and the blank relatively to one another that the resultant lines of cut made by any given point upon the stripper shall be constantlyvarying curves, and that such point shall not retrace its path during the stripping of any one blank, it is obvious that the devices first referred to as old differ in mode of operation and result, as they also do widely in structure, from my improvements. I therefore disclaim all devices whose operation is such that a given point upon the stripper will be caused to retrace its path upon a blank or to form thereon a series of parallel and straight lines.

producing the independent movements of the stripper and the work-plate may be varied greatly without changing the principle of my invention. Thus the stripper may be moved radially in a plane in which the file-blank is caused to reciprocate and the resultant lines of cut still be varying curves. I therefore do not limit myclaim to the precise mechanism shown and described; but

I desire to secure by Letters Patentl. rIhe combination of the stripper, the work frame, an d mechanism whereby one is reciproeated in a given plane while the other is oscillated radially in said plane across the lines of reciprocation, substantially in the manner and for the purposes specified.

2. The combination of a reciprocating stripper rocking freely in its seat, and a work-plate oscillating radially across the line of reciprocation and rocking freely in a direction at right angles to the axis upon which the stripper rocks, substantially as and for the purposes set forth.

3. The combination of the driving-shaft, the lever T, and tool-carrier reciprocated thereby, and the worm-wheel, screw, and crank-disk, and pivoted frame B, oscillated by said crankdisk, the whole arranged and operating substantially as set forth, whereby a rapid reciprocation of the tool-carrier and a continuousv slow radial oscillation of the work across the line of such reciprocation are effected.

ALFRED VEED.

Vitnesses:

CHARLEs F. ZIEGLER, J. XVALTER DOUG-Lass. 

